My old bell (construction - before last century) has adopted and it was time for a new one. I am female and have no clue of installation, I opted for a wireless version, as I promised simplicity. And indeed - Unpack package, insert it into the receiving part 3 AA batery, hang on the wall (not included in the package!) (Or tighten - screws in the package, or sticking with enclosed Tesa). I've just lying around loose. The bell (Baterie is already there) sticking on the outside of the wall draufschreiben (Tesa), its name, and is ready for use. Super easy! What stands nowhere or I've read about - the top ring the bell of the button lights up red. Nice to look at. The choice of ringtones is huge because everyone can find what they need - Jingle Bells and Happy Birthday for example are also included. It's noisy. The distance is with me between the bell at the door and receiving part about 10 meters and it works flawlessly. There are also settings possible if the factory configuration should interfere with other wireless devices, but so far I have not noticed anything and therefore nothing "groped".
All in all - exactly what I need, very easy installation (cheerful).